Because 99% of all 45acp ever made is with LP's; it's a really PITA when you're rolling along and have one get slipped in on you. It would be the equivalent of running all your lug nuts down on all four tires and then running into one single lug nut that happened to be a metric thread.

If you are using a progressive and you are tooling along at 50 MPH. It is kinda like you hit a brick wall when that one piece of brass, that you missed when you were sorting, is put in the resizing die! What a pain in the buttocks!!

If you are using a progressive and you are tooling along at 50 MPH. It is kinda like you hit a brick wall when that one piece of brass, that you missed when you were sorting, is put in the resizing die! What a pain in the buttocks!!

Speedy, the brass has been mailed!

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Those dang things throw enough of a wrench into my game to cause me to get mideivil on them with any close heavy object, and I only hand prime my cases. I can't imagine how fustrating it is for you wealthy guys with a progressive press.